Die casting apparatus



Jan. 10, 1939. T. c. KoRsMo DIE CASTING APPARATUS 2 Sheets-Shet l Filed Feb. 19, 1937 :inventor LD MMGZDAL Cttornegs 2 Sheets-Sheet 2 T. cl KoRsMo DIE CASTING APPARATUS Filed Feb. 19, 1937 Jan. l0, 1939.

RE SURE. FLU l D SUPPLY Patented Jan. 1o, 1939 2,143,323

UNITED STATES PATENT OFFICE DIE CASTING APPARATUS Torbjorn C. Korsmo, Madison, Wis., assignor to Madison-Kipp Corporation, Madison, Wis., a corporation of Wisconsin Application February 19, 1937, Serial No. 126,708

12 claims. (o1. 22-68) The present invention relates to die casting no attention from the operator even when the apparatus and particularly to providing for coolmachine is shut down. High speed operation of ing of the means for feeding metal in moldable the machine to effect a maximum output of castcondition to the die for compression therein. ings is permitted by providing for automatic 5 In a form of die casting machine now known, cooling of the metal feed means every time a 5 plunger means function to transfer a charge of casting is made.

metal from an upright tubular container or well Another important object is to provide for into a closed, multi-part die and to compress the ecient cooling of the metal feed means so that metal therein. 'Ihe plunger 'is then retracted, the feeding means will function properly at all the die opened to remove the casting, another times and will be protected from damage by 10 charge of metal placed in the well, and the die overheating. closed again, ready for the plunger means to A further object is provision for connection of shoot the next casting. The die is of the twothe COOling fluid enducting means t0 the Well part, vertically split type having a split gate or in any of its adjusted DOSitiOuS- i5 pressure chamber opening onto its lower face and A further imDOItant Object reSideS in using the 15 into which the plunger moves during the die exhaust pressure llld fIOIn either the l'Iltercharging operation. The Well, into the upper end mittently actuated DleSSllrefluid 'means emDlOyed of which the successive charges of metal are t0 Operate the die, O1' the Similar means which ladled when the die is open, and from which lthe operate the metal feeding means, to serve as the charges are transferred to the die, is stationary COOlIig medium fOr the latter- ThiS nOt Only 2 en the machine, with its discharge end accurately eifects appreciable economy because of utilization registeringl with the split gate of the closed die, Of the Otherwise Wasted Pressure iluid, but also but slightly spaced from the die te freely permit provides for the desired automatic and internecessary relative movement between the die mitteilt Operatin 0f the COOllllg means incidental parts during opening and closing of the die. The to operation of the machine. Other 'obects and 25 Well is removable, and also adjustable to accomadvantages Will appeal' hereinafter. modate it to different sized dies. Reference is had to the accompanying draw- The machine referred to is semi-automatic in iDgS which illustrate tWO Practical fOrmS 0f a that separate pressure fluid means such as piston Semi-autematie machine Of the type mentiOned and cylinder units are employed to automatically Which embOdy the features Of the Present inven- 30 actuate the die and reciprocatory plunger .of the tionmetal feeding means in the desired direction, Figure 1 iS a frOIlt elevation, 0f the Preferred upon manual operation of separate control valves form 0f the machine in Which the COOling fluid provided on the machine for this purpose. iS provided by themetal plunger Operating Cylin- It is an important object of the present invender exhaust, certain pertebeing breken away to 35 tion to provide fluid means adapted to properly ShOW the metal Charge in the Well ready tO be cool the metal feeding means of machines of the transferred into the clOSed die. above-mentioned type. However,whi1e the cool- Fig 2, an enlarged Section On line 2-2 of ing means described hereinafter are particularly Fig- 1, ShOWng Certain parts in elevatiOn. the

effective and desirable when applied to this type details 0f the @001mg passages in the well, and v4C* of machine, use ef the cooling means is not the metal charge raised into the pressure chamlimited thereto. They may be advantageously ber in the die; 1 employed in other types of die casting apparatus, Fig. 3, a Plan Of the metal Well With its liner; and hence it will be understoodfthat such use ls Fig. 4, a Vertical SeOtiOn through the hand contemplated herein, control valve for either the metal plunger actuat- 45 A particularly 'important object of the invening Cylinder O1 the die actuating Cylinder of Fig. tion is the provision of iluid cooling means for 1, the valve being ShOWn in the pOSition t0 which the metal feeding means which are operated init is moved t0 lower the plunger or Close the die, termittently4 and automatically incidental to the aS ShOWD in Fig- 1;

operation of the machine, and hence only during Fig. 5, a section on line 5 5 of Fig. 4. except 50 operation of the machine. Thus, overcoolingof that the parts are shown diagrammatically in the metal feeding means and the metal therein, order to bring the passages into a single plane; and resulting cessation of production, are avoided, Fig. 6, a similar view of the valve moved to and cooling is provided automatically, but only the plunger elevating or die opening position; and

' 55 when needed, so that the cooling means require Fig. 7, a view similar to Fig. 1 showing a modi- 55 ed form of the machine in which the well cooling fluid is provided byl the die operating cylinder exhaust. v

Each of the machines illustrated comprises a frame made up of a hollow base 8 supporting a hollow frame body 9. Base 8 is open at the top and body 9 at the bottom to provide a free space for the metal plunger operating means described later. Base 8 and body 9 are suitably secured together at their abutting edges.

Frame body 9 has an upright I8 to which the fixed half I I of the die is removably secured. The movable half I2 of the die is detachably affixed to one end of a ram I3 mounted for reoiprocation, in an opening I4 extending through a second upright I5 on the opposite end of the machine, to open or close the die. The manner of operating die half I2 will be referred to later.

As shown in Figs. 1 and 2, the type of die ilustrated, when closed, has a casting cavity I6, a restricted ingate I1 and a communicating cylindrical gate or pressure chamber I8 opening onto the bottom face of the die. Chamber I8 is located on the parting line of the die with half of the chamber in each half of the die. This chamber receives the charge of metal for the die through its open bottom end, the metal then being forced through ingate I1 and compressed under high pressure in cavity I6 by the metal supplying, transferring and compressing means now to be described.

Horizontal portion I8 of frame body 9 is provided With an upright portion 20 having a cylindrical passage 2I extending therethrough. Snugly, but slidably, mounted in passage 2l is a cylindrical metal magazine orl well 22 having a removable bushing or liner 23. The well is rabbeted at 24 and the liner flanged at 25 to support they liner in place in the well, but permit its removal for renewal purposes. Liner 23 is arranged in exact alinement with cylindrical pressure chamber I8 in the closed die, and its interior diameter is substantially the same as that of the pressure chamber.

Well 22 has an annular ange portion 26 at its upper end. Surrounding the well between flange 26 and the upper end of frame portion 20, is a series of stacked, ring-like members 2l. These 'members support the upper end of the well assembly in close proximity to, but slightly spaced from, the bottom face of the closed die, as indi' cated at 28 in Figs. 1 and 2, in order to permit free movement of die part I2. When the die is open and die part Il removed, well 22 and its liner may be lifted out for renewal or other purposes. At this time, certain of the ring-like members 21 may be interchanged for others of different thicknesses, or certain of them added or removed, to change the vertical positionof the well, as would be necessary were a die with its bottom face at a different level substituted. Guide pins 29, 28 on the upper end of well 22 (Figs. 2 and 3) engage sockets 30, 30 in xed die half Il `to insure exact -alinement between liner 23 and chamber I8. a

A plunger 3| is mounted for reciprocation in the lower open end of well 22 and controls the metal receiving capacity thereof. When the plunger is in its lowermost position (Fig. 1), and movable die part I2 is retracted, metal in any suitable condition for casting, generally in the molten state, is taken from any convenient source of supply and ladled by the operator into the well above the plunger until well space 32 (Fig. l) is substantially full. The die is then closed.,

and certain power means, described later, set into operation to raise plunger 3l. The plunger transfers metal charge 33 from the well into pressure chamber I8 (as shown in Fig. 2), and then continues its movement in the pressure chamber, with which it has a somewhat closer t than with well 22, to force the metal through ingate I1 and into die cavity I6. Plunger 3I is then lowered into the well, the die is opened and the casting removed. The machinel is now ready for the next casting operation.

The means for operating plunger 3| comprise a power piston 34 having a rod 35 connected to the metal plunger, the piston operating in a cylinder 36 suitably secured at 31 inside of the machine base 8. Cylinder 36 is ported at 38 and 39 to receive pipe connections 40, 4I, respectively, whereby compressed air may be admitted to or exhausted from each end of the cylinder to move piston 34 in the desired direction. The manual valve adapted to control operation of this piston will be described later.`

A longitudinally adjustable connection between plunger 3l and piston rod 35 provides for regulating the lowermost position to which the plunger may move, i. e., the position with piston 34 at the bottom of its cylinder, so that the capacity of well space 32, and hence the size of metal charge 33, may be varied to take care of different sized castings. This adjustable connection consists of a coupling 42 comprising a plurality of separable members secured together by machine screws 43. Plunger 32 extends into the upper end of the coupling and has a flange and groove connection 44 therewith to prevent lengthwise movement between the parts. The upper end of piston rod 35 is threaded and extends through a threaded passage 45 in the lower member 46 of the coupling, and into a chamber 4I in member 48 of the coupling. A lock nut 49 on rod 35 secures the coupling. Thus, when nut 49 is retracted, coupling 42 may be rotated on rod 35 to raise or lower plunger 32 to any desired position in the well, whereupon the coupling is secured by the lock nut.

When plunger 3l is to be removed for renewal or other purposes, the die is rst opened and die part II and the well parts removed. Screws 43 are then` loosened and the parts of coupling 42 separated, so that plunger 3l may be tilted in opening 2I to clear the parts, and thus permit withdrawal of the plunger from below.

As stated, well 22 is spaced slightly from the bottom of the closed die and leaves a clearance 28. The presence of cylindrical pressure chamber I8 enables plunger 22 to move the metal charge 33 freely into the die, thus permitting passage of the metal past clearance28 without leakage of metal therethrough. However, the metal charge is subjected to considerable pressure a`s it is forced through ingate I'I and into the die cavity and, in order to prevent escape of metal under high pressure at clearance 28, which would endanger the operator, provision is made for transfer of the entire metal charge to the die before the metal is placed under pressure. For this purpose, chamber I8 is made sufficiently large to receive the entire charge of metal 33, and of such shape as to permit its free passage therethrough until plunger 3l enters and seals the bottom end of the pressure chamber, as shown in Fig. 2. Plunger 3I then moves the metal into tapered gate portion I3 and forces' the charge into the cavity through ingate Il.' Obviously, the free movementof the metal into the pressure s.:

ber, above mentioned, is aided by the usual venting of the air from the die which takes place as the metal moves into the pressure chamber.

In order to prevent escape of metal under pressure at clearance 28 when the metal is being forced into the die cavity, the volumetric capacity and shape of chamber |8 must always be such as to receive freely the entire metal charge for the particular size casting being made, i. e., the volume of metal necessary to ll the die cavity and extend sufficiently into the pressure chamber |8 to be acted upon by the plunger. This volume determines the size of the metal charge which is to be placed in well 22. It also indicates any necessary adjustment of plunger 3|v in the well so that the capacity of well space 32 will be such that, when the well is full, it will contain a charge of proper volume.

No claim is made herein to the die casting machine features sofar described, since they are fully covered by application Serial No. 72,161, led April 1, 1936, by Raymond J. Schultz (Patent No. 2,103,438, dated December 28, 1937). The iiuid cooling means for the metal feeding means for the die which form the subject matter of the present improvements, will now be described.

Referring rst to the preferred form of construction of Figs. 1 to 6, it will be noted, in Fig. 2 particularly, that,vwell Vsleeve 22 is formed internally with a wide annular groove 50 closed at its top 5| and at its bottom 52. 'I'hus there is provided, with well liner 23,A an annular chamber 53 extending substantially the entire length of the Well and adapted to have a cooling fluid circulated therethrough. An inlet passage 54 (Fig. 2) is provided in frame portion 20 for introduction of the cooling fluid. Inner end 54' of passage 54 registers with a. slot 55 in well 22 to feed the cooling fluid into the lower portion of the cooling chamber, whence it is evenly distributed and circulated around the outside of well liner 23, and into contact with substantially the entire outer surface of the liner and the'entire inner surface of well sleeve 22. The cooling fluid then escapes at the top of the well through a plurality of radial, equiangularly arranged outlets 56 formed by openings 51 in well sleeve 22 and grooves 51 on the underside-of well flange 26. This arrangement of the outlets materially aids in uniform circulation of the cooling fluid throughout chamber 53 during its passage therethrough. The elongated form of slot 55 provides for admission of the cooling uid irrespective of the height to which well 22 is adjustedy for use with different sized dies.

A handle type, rotary control valve for power cylinder 36 is located at a convenient point on the machine, and is indicated at A in Fig. 1, with connections to pipes 46, 4|, whereby pressure uid may be simultaneously supplied to and exhausted from opposite ends of the cylinder to move piston 34 in the desired direction. The inlet of the valve is connected by pipe 58 to a continuous source of supply of compressed air, and the exhaust port thereof leads by way of pipe 59 to passage 54 (Fig. 2) communicating with the well cooling chamber 53. I

Details of valve A appear -in Figs. 4 to 6. The valve comprises a casing 60 having a ported valve seat cover 6|. Chamber 62 in casing 60 contains a rotatable; ported valve member 63 urged against seat member 6| by a coil spring 64. Valve inlet 65 continuously supplies compressed air to chamber 62 from pipe 58. Cylinder pipe line 4| connects to passage 66 in valve cover 6|, pipe line 48 to passage 61, and exhaust pipe 59to passage 68, al1 of these passages opening onto the lower face of the cover in arcuate arrangement (see Fig. 4). Also arranged in alined, arcuate formation are a through passage 69, a similar passage 16, and a groove 1| in valve disk 63. Valve member 63 is operated by a stem 12 (Fig. 4) having a handle 13.

With metal plunger 3| lowered, as in Fig. 1, valve handle 13 is located in the position of Fig. 1 and the full line position of Fig. 4. -At this time, the valve passages are connected as indicated in Figs. 4 and 5, full pressure flowing from valve chamber 62 through passages 69 and 66 to pipe 4|, and thence to the upper end of power cylinder 36. At the same time, passage 16 is blanked, but groove 1| connects passages 61 and 68, so as to exhaust the lower end of cylinder 36 through pipe 40 to exhaust pipe 59, and thence through well cooling chamber 53 to the atmosphere.

When plunger 3| is vto be elevated to shoot a casting, handle 13 is moved to the left hand dotted line position of Fig. 4. The positions of the ports at this time are shown in Fig. 6, in which full pressure from chamber 62 flows through passages 10 and 61 to pipe 40, and thence to the bottom of cylinder 36 to move piston 34 upwardly and transfer the metal charge from.

`the well to the die, where it is compressed into the cavity under extremely heavy pressure. At the same time, passage 69 is blanked, but groove 1| connects passages 66 and 68 to vent thetop of cylinder 36 through pipe 4| to exhaust pipe 59, and thence through well cooling chamber 53, as before. Movement of handle 13 to the middle dotted line position of Fig. 4, blanks passages 69 and 1D, but connects passages 66 and 61 to passage 68, and thus vents both ends of cylinder 36 into exhaust pipe 59.

In the machine of Figs. 1 to 6, the separable die may be operated either manually or by power to open and close the dies. Since pressure fluid operating means preferably are used, this type is illustrated. These means comprise a power cylinder 14 having a anged open end 14 secured by bolts 15 to the outer face of upright |5. Cylinder 14 receives the piston head 16 formed on the outer end of ram i3, while the ram operates through a stuffing box 11 during its movements in cylinder 14. This cylinder is ported at 18 and 19 to receive pipe connections 80 and 8|, respectively, whereby pressure iluidmay be simultaneously admitted to and exhausted from opposite end of the cylinder to move piston 16 in the desired direction. A manually controlled valve for power cylinder 14, similar to the metal plunger controlling valve A, is located at a convenient place on the machine and is indicated at B in Fig. 1, with connections to pipes 88 and 8|. 'I'he inlet of valve B is connected by pipe 82 to a supply of pressure fluid, and the exhaust port connects to a pipe 83 leading to atmosphere. Referring to Figs. 4 to 6, supply pipe 82 connects to inlet 65, die operating cylinder pipe line 80 con nects to passage 66, and pipe line 8| to passage 61 in the valve.

With the die closed, handle 13 of die controlling valve B is located in the position' of Fig. 1 and thefull line position of Fig. 4, with the valve passages in the positions of Figs. 4 and 5, whereby, as will be clear, pressure iluid is supplied to the outer end of cylinder 14 and exhausted from the inner end thereof. Thus, the die closed position of valve B corresponds to the plunger lowered position of valve A. To open the die, handle 13 oi' valve B is moved to the left hand dotted line position of Fig. 4 so as to move the valve into the position-of Fig. 6, whereby pressure fluid will be fed to the inner end of cylinder M and exhausted from the outer end thereof. Hence,

the die open position of valve B corresponds tor the plunger elevating position of valve A.

As indicated, the complete cycle of operations of the machine, starting with the die open, plunger lowered position, comprises placing the metal charge in the well, operating valve B to close the die, operating valve A to shoot the casting, operating valve A again to lower plunger 3l, and then operating valve B again to open the die so the casting may be removed. During this cycle of operations, a large predetermined quantlty of exhaust compressed air from power cylinder 36 is automatically fed twice to well cooling chamber 53 as a result of operation of valve A, once when the plunger is elevated and again when it is lowered. Thus, means are provided which not only effectively cool the metal feeding means, i. e., the Well, its liner and the plunger therein, but which are operated automatically and intermittently incidental to the operation of the machine, and only during its operation.

Various practical advantages accrue from this arrangement. Cooling of the metal well each time acastingis shot permits high speed operation of the machine by preventing overheating and thus insuring proper operation of the metal `feeding means. The cooling means function automatically, and only when needed, and hence require no attention from the operator, even when the machine is shut down. The intermittent cooling action efected by the operation of the machine prevents overcoolingof the metal well and the metal charge, and resulting stoppages of production, particularly those stoppages which would occur as a result of overcooling between casting shots were continuous cooling, especially water cooling, used. Regardless of the number of shots per hour, the intermittent cooling maintains the proper temperature balance for the metal well. With constant cooling this balance would be destroyed, since some castings must be produced at a lesser number of shots per 'hour than others, and hence the time intervals during which cooling between shots may take place, are longer.

The cooling means described insure proper functioning of the metal feed means at'all times by chilling the metal charge sufficiently to prevent passage of the nTetal into the limited clearance between well liner 23 and plunger 3|; also by uniformly cooling the well throughout its length so as to avoid distortion or warpage of the well which would be caused by cooling restricted to only a portion thereof. Thisv method of cooling also aids in otherwise protecting the metal feeding parts from damage which would result from overheating. Formation of groove 50 in well sleeve 22, and the consequent location of the cooling chamber`53 between the well parts, simplifies the construction and minimizes the expense and number of well liner renewals. Cooling of the well is also aided due to the fact that the well is always spaced from the die at 28, thus avoiding direct conduction of heat thereto from the die.

Use of compressed air to cool the well also is highly advantageous as compared with water cooling, because no drain connection is required for the cooling uid after it has performed its cooling function, air leakages to atmosphere in arcanes the cooling uld conducting parts, or at least minor leakages, are unobjectionable, and, since plunger operating piston 341 is compressed air actuated, there is already present an available source of air supply. Use of the exhaust fluid from cylinder 36 not only provides for automatic and intermittent cooling of the well, but involves utilization of a convenient source of supply already on the machine, thus avoiding the need of a separate independent source, and is also important from the standpoint of economy of operation of the machine, since efficient use is thus made of pressure uld which otherwise would be wasted.

The modified form of machine appearing in Fig. 7 is the same in construction and general mode of operation as that of Figs. 1 to 6, except that in the modified form the exhaust pressure fluid from die operating power cylinder 'lll is utilized to cool the metal well 22, instead of the exhaust from metal plunger operating power cylinder 35, as in the preferred form. For this purpose, the exhaust port 68 of die control valve B, instead of leading to the atmosphere, as in Fig. l, is connected by a pipe line S5 to passage 5d (Fig. 2) leading to well Ventilating chamber 53.

The metal feeding means for the die, in this form of the machine, may be manually or power operated, but preferably vare operated by the compressed air actuated type of means of Figs. 1 to 6, and hence such means are illustrated. In the modified machine, valve A, which controls movement of piston l'in cylinder 36 to operate the metal feed means, has its exhaust port 68 connected to atmosphere by a pipe llt, instead of to passage 5ft leading to metal well cooling chamber 53, as in the construction of Figs. 1 to 6.

It will thus be clear that during the complete cycle of operations of the modified machine, a large predetermined quantity of exhaust pressure uid from power cylinder i4 `is automatically fed twice to well cooling chamber 53 as a result of operation of valve B, once when the die is opened and again when it is closed. Consequently, substantially all, if not all, of the important practical advantages set forth in connection with the preferred construction of Figs. 1 to 6, are also characteristic of the modied machine of Fig. 7.

While two practical embodiments of the invention have been illustrated and described herein, it is obvious to those skilled in the art that 'various changes ln the construction may be made within the scope of the invention, except as the same may be limited by the appended claims.

What is claimed is:

1. In a die casting machine, including a frame and a separable die,-the combination of a removable well on said frame adapted to receive metal for transfer to the die, saidiwell having a. cooling uid circulating chamber extending entirely around the well and substantially the full length thereof and means for supplying a cooling fluid to said circulating chamber to regulate the temperature ofthe Well and any metal therein. 2. The combination in a die casting machine, including a frame anda separable die, a well on said frame adapted to receive metal for transfer to the die, said well having an annular cooling chamber therein provided with a cooling fluid inlet at one end and a plurality of fluid outlets at its opposite end arranged at spaced intervals entirely around said chamber; and means for supplying a cooling fluid to said fluid inlet.

3. In a die casting machine, including a frame and a separable die, the combination of a well on the vframe adapted to receive metal for transfer to the die, said Well having a chamber for Icirculation of a cooling iluid and a cooling fluid inlet therefor, the Well being provided with an upper supporting flange having at least one groove on its under side communicating with the cooling chamber to form an outlet therefor; and annular means surrounding the Well and engaging said flange and said frame to support the well.

4; In a die casting'machine, including a frame and a separable die, a removable well mounted on the frame to receive metal for transfer to the die, said well comprising an outer tubular member i and an inner tubular liner member provided with an elongated tubular cooling compartment therebetween having a cooling fluid inlet andan outlet.

5. 'Ihe combination in a die casting machine, including a separable die, of a frame having a cooling fluid supply port; and a Well on the frame adapted to receive metal for transfer to the die, 'said Well being adjustable relatively to the die and `provided with means for circulation of a cooling fluid which communicate with said uid supply port in the frame irrespective of adjustment of the Well.

`6. The combination in a die casting machine, including a separable die, of a frame having a cooling fluid supply port; andan upright well mounted on the frame for vertical adjustment towards or from the die and adapted to receive metal for transfer to the die, said well having a chamber for circulation of a cooling fluid therethrough and an inlet for said chamber communieating with said supply port, the inlet being elongated vertically'to insure registry with the supply port irrespective of vertical adjustment of the well.

7. In a die casting machine, including a separable die operable to open and close the die, the combination oi means operable to feed metal to the die when closed; pressure fluid actuating means which are adapted to be energized incidental to the cyclic operation of the machine and to discharge exhaust fluid therefrom; and means for directing said exhaust iiuid into contact with the metal feeding means to cool the feeding means and regulate the temperature of any metal therein.

8. In a die casting machine, including a separable die, the combination of means for feeding metal to the die; means for operating the die to open and close the same; means for operating the metal feedingmeans, one of said operating means being presure fluid actuated; and means for cooling the metal feeding means and regulat-` ing the temperature of any metal therein by exhaust fluid from said pressure fluid actuated operating means.

9. In a die casting machine, including a vertically split die having a split gate, the combination of operating means for opening and closing the die; an upright well located beneath the die and adapted to receive metal for transfer to the die, said well having means adapted for circulation of a cooling fluid therethrough; means adapted for operation to transfer metal from the well into the die; pressure uid actuating means for one of said operating means; and means, operated automatically as a result of operation of the machine, for feeding exhaust pressure uid from said pressure iluid actuating means to said fluid circulating means for the Well.

10. In a die casting machine, including a separable die operable to open and close the die, the combination of a Well adapted to receive metal for transfer to the die; means adapted for operation to transfer metal from the well to the die when closed; operating means for the die; operating means for the metal transfer means, one of said operating means including a piston and cylinder unit; valve controlled means for feeding pressure fluid to said cylinder and venting exhaust fluid therefrom to actuate the piston; and means for conducting said exhaust fluid into contact with the metal well for cooling purposes.

11. In a die casting machine, including a sep arable die operable to open and close the die, the combination of a well adapted to receive metal for transfer to the die; means adapted for operation to transfer metal from the Well to the closed die; operating means for the die; operating means for `the metal transfer means, one of said operating means including a piston and cylinder unit; means, including a control valve, for periodically supplying pressure fluid to Ysaid cylinder to operate the piston therein; and means controlled by said valve for conducting a cooling fluid into contact with said well.

12. The combination in a die casting machine, including a separable die, of operating means for the die; means for feeding metal to the die; means for operating the metal feeding means;

means for directing a cooling fluid into contact with the metal feeding means; and cooling :duid supply means which are operated automatically as a result of operation of the machine so that cooling fluid is `supplied to said fluid directing means only during operation of the machine.

TORBJORN C. KORSMO. 

